85/15 Share definition Flag It's a mixture of ground beef. The 15% represents the fat content of the meat. Usually sold in areas populated by poor people. Ground beef with a high fat content. This is known as "85/15." 85/15 by SpookyCat March 20, 2014 0 0 Get merch Get the 85/15 mug. Buy Now — $32.95 See more merch